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    Operating Oil pressure?

    Whoops! That 10W40 was a typo, which I just corrected. There are 10W40 HDEO oils today, however, and they offer better cold and cool oil flow but I still prefer 10W30 for my situation as the viscosity spread relies less on the Viscosity Index Improvers (VII)in the oil. and they are cheaper...
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    head cylinder rebuild questions

    Exhaust valves are way too close. They need to be sunk to 0.051-063" to make spec. They are .028-.036" now. Did they put in new exhaust seats? Anyway, the deeper the valves are sunk, the less chance you'll have valve to piston clearance issues. I'd think you are practically guaranteed to have...
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    Operating Oil pressure?

    No need to apologize. You asked what you asked and I replied. Both were within the limits of politeness. What I find more telling is that nobody has yet looked up the previous posts and found the real answer, which is NOT 10 psi/1000 rpm for the IDI. There is a FACTORY SPEC for oil pressure...
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    Fitting Valve Guide Boss in a 7.3 Head?

    Nice to hear they stood up. Every organization makes mistakes. How they are handled is a great indicator of character.
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    Oil temp.... bad sensor or gauge?

    That's about what mine did. Like I said, about 185 was normal for a fully warmed engine with a light to moderate load. And it was sump temp, too.
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    Oil temp.... bad sensor or gauge?

    The easiest problems to fix are the ones that don't exist! Situation normal!
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    Oil temp.... bad sensor or gauge?

    I had never seen or heard of an oil temp gauge with a Banks kit until now. Mine didn't have one, though I installed one later. Are you sure it's not trans temp? Not trying to insult your intelligence but I have used gauges that said "Oil Temp" as trans temp gauges and the numbers you listed...
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    help with getting my truck to run at the right temp please???

    At low loads, diesels do not generate a lot of heat so tend to run cool. On top of that, they have monster cooler systems to cover them when they are under a load. Your truck sounds very typical and mine does the same. Put 2000# in the bed and drive around... the needle will go higher. MPG...
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    head cylinder rebuild questions

    FWIW, my original springs with roughly 140K miles on them tested at 77.8 lbs @ mounted height. The new springs from Sealed Power (VS-693) tested at 82.5 lbs., again shimmed to the mounted height spec'ed in the manual. This spring fits a lot of other applications, including the 7.3L PSD...
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    What's that you say? 4400 miles in a 25 year old van?

    First thing about taking off in something old or tired... be realistic. Fix any known issues before you go and don't "hope" that something marginal is going to make it. Prep well and realistically. After that, it's all about mechanical sympathy. Don't push it. Gaugewatch. Listen, look and smell...
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    Thickest Head Gaskets?

    Something to consider! The tolerances would have to be pretty close already, perhaps via previous machine work or tolerance-stacking at the factory, for 0.002-.003 extra rod bearing clearance to get the valves and pistons kissing. Still, it's the kinda off-the-wall thing that could bite one in...
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    Thickest Head Gaskets?

    They are and were sourced from the AERA (Automotive Engine Rebuilders Association) bulletins on the 6.9-7.3L engines, or from factory manuals. Machine shops are usually AERA members, so he should have access to the AERA database for confirmation. The only part that's "off the reservation" is...
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    Is there any more black....?

    That is a serious waste of money with absolutely no benefit to your engine. Let me tell you why. 1) A statistic from the filter industry is that that average oil filter is loaded to about 50% of capacity when changed for a normal interval oil change. 2) Filtration efficiency actually improves...
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    Thickest Head Gaskets?

    Also, I forgot to mention my piston protrusion was 0.016"
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    Thickest Head Gaskets?

    You had best be determining the cause for this. If the valves are indeed tapping the piston, this engine has been apart before and either there is too much piston protrusion (block was decked too much in the past) and/or the heads have been milled to much or the valve recession was incorrectly...
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    Not impressed with Howes fuel addative

    Mel, thanks for the answer about the viscosity compensation... something I forgot. Would you explain how it works? My followup question is about the kind of "dirt" commonly found in a mechanical fuel injection system; where it's found, what type is it and how it effects performance? You have no...
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    Not impressed with Howes fuel addative

    How can any fuel additive increase power? Really only one sure way, but one that isn't applicable in every case as Chris142 proved (depending on which additive he used). The sure way is a cetane improver but how much you gain is directly proportional to the particular fuel. Increasing the...
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    Any style of muffler to stay away from?

    The stock mufflers were chambered and I have never heard of one carboned up to the point of being a problem. I would vote for a straight-thru also, but one with a large chamber. That will result in the combination of the lowest restriction and the least likelihood of a drone. Straight thru...
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    whats your oil pressure at???

    The service manual lists 10 psi idle and 40-70 psi at 2200 rpm with hot 10W40 oil (exact temp not specified, presumably ~200F as with most other engine mfrs.). The IDI lube system is a low pressure, high volume system. Your oil pressure is perfectly normal.
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    Let's talk filtration

    I'm not absolutely sure I still have the tester, but it would be with it. As I said, it was demonstrated to me that the conversion was inaccurate for LSD, so it would likely be wildly inaccurate for ULSD. I'll check a couple of likely spots next time I am in the shop, but I haven't used the...
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    Let's talk filtration

    The SG type cetane testers are not accurate for LSD or ULSD. I have one too... have since the early '90s. In the course of a story on fuels and how cetane effect perfomrance, which was about the time the LSD came out in the late '90s, I found out from the Stanadyne Power Formula chemist that...
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    Let's talk filtration

    The industry generally describes "nominal" as the smallest particle the filter can catch 50% of on the first pass but industry is not required to use any particular standard and fuel filter is always a first pass filter (though some of the cleaned fuel does return to the tank). I see it as an...
  23. P

    Replacing lifters push rods etc

    I misunderstood. I thought it was Waystro's '86 we were talking about. I have a booklet from Ford Parts and Service Training that announced changes to the diesel for '87 and the new rockers are mentioned as being one of them. This book was published in July of 1986.
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    Replacing lifters push rods etc

    Were the updated rockers ever put on a 6.9L by the factory? Don't think so, but it would be interesting to prove one way or another. I KNOW my '86 6.9L (2/86 build date )did NOT, because I have owned it since 7K miles.
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    Power Through Precups?

    Max Lagod at Hypermax was involved in building the first IDI diesels at IH in the '70s. He also was involved with the DT466 at IH, for which Hypermax is now most noted for supplying the tractor pullers using that engine. He is ONE SHARP DUDE! The Hypermax truck was really nothing even close to...

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